Development of Thermal Barrier Coating System with an intermediate layer containing MoSi2 with Superior Thermal Cyclic Properties

点击翻译按钮获取中文摘要

The authors have developed the method of improving the thermal cyclic resistance for the thermal barrier coating system that is deposited on gas turbine components. Conventional thermal barrier coating consists of duplex system, top coating and bond coating. The developed system has a protective intermediate layer of MoSi2 for preventing oxidation of the bond coating, Conventional duplex plasma sprayed coating was delaminated after 20 thermal cycles. On the other hand, the developed triple layered coating system was not delaminated up to 60 cycles. The reason of the enhanced resistance to thermal cycles for the developed triple layered coating system is that the MoSi2 layer existing between the top coating and the bond coating has the self-repairing property. MoSi2 oxidizes to form SiO2 which seals the cracks and pores formed between the top coating and the bond coating.